Abstract
New data are collected bearing on the relationship of the shape of the axon action potential in nerve to the velocity of propagation. It is found that the product of the duration of the rising phase of the potential wave and the velocity of conduction is essentially constant when the 2 variables are caused to alter with temp. The axon action potential decreases in magnitude in the cooled nerve. A theoretical discussion follows, in which an attempt is made to reconcile these 2 facts with the membrane theory.

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